A rock burst usually causes a roadway collapse or even an instant blockage. When the deformation energy accumulated in surrounding exceeds minimum required for dynamic destruction of roadway, accident will occur. According to statistics, 85% accidents occur roadways. This paper establishes strong-soft-strong structural model stability control and anti-impact antiseismic mechanisms mechanical ar...

Rock burst is a catastrophic phenomenon that often occurs in underground rock mass engineering. In order to reveal the essence of hard roof process roadway excavation, particle discrete element method used establish model and simulate disturbance harmonic dynamic load based on analysis accident deep mine. The crack field, stress displacement kinetic energy surrounding disturbed by cyclic were a...

In the tunnel construction, due to the limitation of the survey and design and the complex dynamics of tunnel surrounding rock geological conditions, so it is difficult for complex geology with the microscopic accurate grasp, often which caused by geological exploration data do not tally with the actual situation, often encountered in karst water inrush, large deformation in weak rock, cave-in ...

A portable high-voltage (HV) pulsed generator has been designed for rock fragmentation experiments. The generator can be used also for other technological applications. The installation consists of low voltage block, HV block, coaxial transmission line, fragmentation chamber, and control system block. Low voltage block of the generator, consisting of a primary capacitor bank (300 μF) and a thyr...

Abstract The coal seam bifurcation area (CSBA) exists widely in measure strata, where the geological weak surface (GWS) slip overburden structure is easy to induce burst. mass of face shows overall instability failure and high-speed throwing characteristics during burst, seriously threatening safe efficient mine production. In order understand GWS-induced burst caused by CSBA find main controll...